Agilent Technologies InfinityLab 1290 Infinity II User Manual page 57

4 Using the Module
General Considerations
Table 10 Volatile mobile additives compatible with ELS detection
Mobile Phase Additive
Acids
Trifluoroacetic Acid (TFA)
Formic Acid
Acetic Acid
Bases
Ammonia
Methylamine
Ethylamine
Triethylamine
Buffers
Ammonium Formate
Ammonium Acetate
Ammonium Bicarbonate
Ion-Pair Reagent
Pentafluoropropionic acid (PFPA)
Heptafluorobutyric acid (HFBA)
Nonafluoropropionic acid (NFPA)
Tridecafluoroheptanoic acid
Agilent InfinityLab ELSD User Manual
pKa pKb
0.3 13.70
3.75 10.25
4.75 9.25
9.25 4.75
10.66 3.34
10.81 3.19
11.01 2.99
3.8
9.2
4.8
9.2
6.3
9.2
10.3
~0.6
~0.6
~0.6
~0.6
pH Range Bp (°C)
72.4
100.7
116.0
-33.4
-6.6
16.6
89.3
3.0 – 5.0
8.2 – 10.2
3.8 – 5.8
8.2 – 10.2
6.8 – 11.3
97
120
140
175
Mp (°C)
-15.4
8.3
16.6
-77.7
-94.0
-81.0
-114.7
120
111
106
57